Very different countries.
The Netherlands for example got their last reset by completely losing the Dutch empire.
Also, some societies have flatter curves than others. That really maps 1:1 to your style and culture of living and where the priorities are.
If your priorities are to be the best as fast as possible (Germany) you will have less time between resets. If your priorities are "let's chill and wait until the coconut falls from the tree into my hand", your society might be able to have a far longer time between resets.
But in the end: It's an iterative process. Which means: There must be iterations.
Not sure why you are being downvoted. What you are saying has a lot of truth to it. It is directly observable in the history of nations.
Germany has to be forced to accept that, although it was advanced, it could not have the European empire it thought it deserved. Japan had to learn a similar lesson. The speed and horror of the reset was in direct proportion to the potential for advancement and high society in these nations.
Ghana, where I come form, for example, has not has to experience any massive upheaval even from its pre-colonial and colonial days up till now. Our society is laid-back, and moves slowly. Even many other African countries have had to have their national reckoning in the form of civil wars and other huge upheavals in order to settle into a viable way of existing and advancing.
And, like you said, this is iterative. Given the nature of people in a nation and its fundamental geopolitical position, the same question will need to be answered after every N generations. Germany is central to Europe, and already a generation that is far removed from the world wars are starting to rethink why it shouldn't assert itself more strongly. Same in Japan.
THe way to analyze the iterations of the US is to understand that the primary threats are from within. It may not implode complete, but civil war and the civil rights era show that the potential is there for massive unrest and violence.
This sounds about as scientific as phrenology.